Battery monomer, battery and electric device

Abstract

The utility model provides a battery monomer, a battery and a power utilization device. The battery monomer comprises a shell, an electrode assembly and an end cover, the housing has an opening. The electrode assembly is housed within the case. The end cover covers the opening. Wherein the shell comprises a first part and a second part, the first part is integrally formed and comprises a bottom wall and a first side wall, the bottom wall and the end cover are oppositely arranged, the first side wall and the second part are both connected with the bottom wall and the end cover, and the first side wall and the second part are connected and define an opening. According to the invention, the manufacturing yield of the battery monomer can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery monomer, a battery and a power consumption device. BACKGROUND

[0002] Battery monomers are widely used in electronic devices such as mobile phones, notebook computers, electric vehicles, electric vehicles, electric aircraft, electric ships, electric toy cars, electric toy ships, electric toy aircraft and electric tools, etc. Battery monomers can include cadmium-nickel battery monomers, hydrogen-nickel battery monomers, lithium-ion battery monomers and secondary alkaline zinc-manganese battery monomers, etc.

[0003] In the development of battery technology, how to improve the manufacturing yield of battery monomers has always been a research direction in battery technology. UTILITY MODEL CONTENT

[0004] In view of the above problems, the present application provides an electrode assembly, a battery monomer, a battery and a power consumption device, which can improve the manufacturing yield of the battery monomer.

[0005] In a first aspect, the present application provides a battery monomer, which comprises a shell, an electrode assembly and an end cover. The shell has an opening. The electrode assembly is accommodated in the shell. The end cover covers the opening. Wherein, the shell comprises a first part and a second part, the first part is integrally formed and comprises a bottom wall and a first side wall, the bottom wall is arranged opposite to the end cover, the first side wall and the second part are both connected to the bottom wall and the end cover, and the first side wall and the second part are connected and define the opening.

[0006] In the above scheme, by integrally forming the bottom wall and the first side wall, the bottom wall and the first side wall can be prepared by bending process, thereby reducing the manufacturing difficulty of the bottom wall, improving the manufacturing yield of the shell, and reducing the manufacturing cost.

[0007] In some embodiments, the second part comprises a second side wall and a third side wall, the first side wall and the second side wall are arranged opposite to each other, and the first side wall and the second side wall are connected through the third side wall.

[0008] In the above scheme, through the above arrangement, it is beneficial to reduce the number of side walls integrally formed with the bottom wall, thereby reducing the manufacturing difficulty of the first part, improving the manufacturing yield of the shell, thereby improving the manufacturing yield of the battery monomer and reducing the manufacturing cost.

[0009] In some embodiments, the area of the first side wall is greater than the area of the third side wall, which is beneficial to increase the connection size between the first side wall and the bottom wall, improve the connection strength of the bottom wall and the first side wall, thereby reducing the possibility of breaking when the first side wall and the bottom wall are integrally formed, and improving the reliability of the first part.

[0010] In some embodiments, the third side wall and the first side wall are welded and form a first weld, and in a direction of the second side wall pointing to the first side wall, the first weld does not exceed a surface of the first side wall away from the second side wall.

[0011] In the above scheme, the first weld is prevented from protruding from the surface of the first side wall away from the second side wall, thereby reducing the risk of the first weld loosening or even falling off due to interference with other components, and improving the reliability of the shell.

[0012] In some embodiments, the electrode assembly includes a flat portion and a bent portion, the third side wall and the first side wall are welded and form a second weld on a side of the first side wall away from the second side wall, and in a direction of the second side wall pointing to the first side wall, the second weld and the flat portion are arranged without overlapping.

[0013] In the above scheme, the electrode assembly is formed into a flat portion and a bent portion after winding, the area of the flat portion is larger than the area of the bent portion, the second weld can be formed by means of penetration welding to fix the third side wall and the first side wall together, and when the electrode assembly is in thermal runaway and expands and deforms, due to the larger area of the flat portion, the flat portion will press the first side wall and the second side wall when it expands and deforms, and due to the arrangement of the second weld and the flat portion without overlapping in the direction of the second side wall pointing to the first side wall, the flat portion will not directly press the second weld, thereby reducing the possibility of the second weld cracking when the flat portion expands and deforms, and improving the reliability of the battery cell.

[0014] In some embodiments, the third side wall abuts the surface of the first side wall facing the second side wall, to reduce the difficulty of assembling the third side wall and the first side wall, and improve the production efficiency.

[0015] In some embodiments, the number of third side walls includes two, the two third side walls are arranged oppositely, and at least part of the first side wall is located between the two third side walls.

[0016] In the above scheme, by the above arrangement, the difficulty of aligning the third side wall and the first side wall is reduced, and the third side wall can clamp the first side wall to reduce the possibility of misalignment of the first side wall and the third side wall during fixing.

[0017] In some embodiments, the second side wall and the third side wall are connected through a circular corner, and when the second side wall and the third side wall are formed through a bending process, the circular corner can release stress to reduce the possibility of breakage between the second side wall and the third side wall.

[0018] In some embodiments, the second component includes a second side wall and a first third side wall, the first component further includes a second third side wall, the second side wall is arranged oppositely to the first side wall, the first third side wall and the second third side wall are arranged oppositely, and the first side wall and the second side wall are connected through the third side wall.

[0019] In the above scheme, by the above arrangement, increasing the number of side walls integrally formed with the bottom wall is conducive to reducing the possibility of separation of the bottom wall and the side wall, thereby improving the reliability of the shell.

[0020] In some embodiments, the bottom wall is welded with the second component and forms a third welding mark on the side of the bottom wall away from the second component, and the thickness of at least part of the second component is greater than the thickness of the bottom wall, which is conducive to reducing the difficulty of welding and improving the reliability after welding.

[0021] In some embodiments, the material of the shell includes steel, which is conducive to reducing the manufacturing cost and improving the overall strength of the shell.

[0022] In some embodiments, the thickness of the first component and the thickness of the second component are the same, so as to reduce the differentiation of the strength of the first component and the second component, improve the universality of the first component and the second component, and reduce the manufacturing cost.

[0023] In a second aspect, the embodiments of the present application provide a battery cell.

[0024] In a third aspect, the embodiments of the present application provide a power consuming device, which comprises the battery as described in any of the preceding embodiments, and the battery is used to provide electric energy.

[0025] The above description is only a summary of the technical solutions of the present application. In order to more clearly understand the technical means of the present application, the following specific embodiments of the present application can be implemented according to the content of the description, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0027] Figure 1 is a structural schematic diagram of a vehicle provided by the embodiments of the present application;

[0028] Figure 2 is an explosion structural schematic diagram of a battery provided by the embodiments of the present application;

[0029] Figure 3 is a structural schematic diagram of a battery module provided by the embodiments of the present application;

[0030] Figure 4is a schematic diagram of an explosion structure of a battery monomer provided by an embodiment of the present application;

[0031] Figure 5 is a schematic diagram of a structure of a shell provided by an embodiment of the present application;

[0032] Figure 6 is a schematic diagram of an explosion structure of a shell provided by an embodiment of the present application;

[0033] Figure 7 is Figure 5 is a schematic diagram of an enlarged structure of P in FIG. 7;

[0034] Figure 8 is Figure 5 is a schematic diagram of another enlarged structure of P in FIG. 7;

[0035] Figure 9 is a schematic diagram of a top view of a structure of a shell provided by an embodiment of the present application;

[0036] Figure 10 is a schematic diagram of a top view of another structure of a shell provided by an embodiment of the present application;

[0037] Figure 11 is a schematic diagram of an explosion structure of another shell provided by an embodiment of the present application;

[0038] Figure 12 is a schematic diagram of a sectional view of a structure of a battery monomer provided by an embodiment of the present application;

[0039] Figure 13 is Figure 12 is a schematic diagram of an enlarged structure of Q in FIG. 9.

[0040] Label description

[0041] 1000, vehicle;

[0042] 100, battery; 200, controller; 300, motor; 400, box; 410, first box part; 420, second box part; 430, containing part; 500, battery module;

[0043] 110, battery monomer;

[0044] 10, shell; 11, first part; 12, second part;

[0045] W1, bottom wall; W2, first side wall; W3, second side wall; W4, third side wall; W41, first third side wall; W42, second third side wall;

[0046] E, opening;

[0047] H1, first welding mark; H2, second welding mark; H3, third welding mark;

[0048] 20, electrode assembly; 21, flat portion; 22, bent portion; 30, end cap. DETAILED DESCRIPTION

[0049] The embodiments of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot be used to limit the protection scope of the present application.

[0050] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the specification herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application; the terms "comprising" and "having," and any variations thereof, as used in the specification and claims herein, are intended to cover both the inclusive and exclusive aspects of the terms.

[0051] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly and specifically limited.

[0052] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0053] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0054] In the description of the embodiments of the present application, the term "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0055] In the description of the embodiments of the present application, the orientations or positional relationships indicated by the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0056] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be direct connection, can also be indirect connection through an intermediate medium, can be internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0057] In the embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging.

[0058] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead-acid battery, etc. The embodiments of the present application are not limited thereto.

[0059] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of the battery cell, active ions (such as lithium ions) are inserted and extracted between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, which can prevent the positive and negative electrodes from short-circuiting, and at the same time allow the active ions to pass through.

[0060] In some embodiments, the electrode assembly is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0061] In some embodiments, the electrode assembly is a stacked structure.

[0062] In some embodiments, the shape of the electrode assembly can be cylindrical, flat or polygonal, etc.

[0063] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or other shaped battery cell, the prismatic battery cell including a square battery cell, a blade battery cell, a multi-prismatic battery cell, such as a hexagonal battery cell, etc.

[0064] The battery referred to in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0065] In some embodiments, the battery can be a battery module, when there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0066] In some embodiments, the battery can be a battery pack, the battery pack including a box body and battery cells, the battery cells or battery modules being contained in the box body.

[0067] In some embodiments, the box body can be part of the chassis structure of the vehicle. For example, part of the box body can be at least part of the floor of the vehicle, or part of the box body can be at least part of the cross beam and longitudinal beam of the vehicle.

[0068] In some embodiments, the battery can be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0069] The battery cell includes a shell and an electrode assembly, the electrode assembly being contained in the shell, the shell including a shell body and an end cover, the shell body including a bottom wall and a side wall, generally, the bottom wall needs to be prepared separately and then capped on the hollow structure enclosed by the plurality of side walls, the bottom wall needs to be formed by stamping to connect with the side wall during preparation, which leads to higher precision requirement of the stamping die for the bottom wall, and in the process of batch production, as the service life of the stamping die decreases, the manufacturing yield of the bottom wall decreases, thereby causing the yield of the shell body to decrease, and the manufacturing cost is increased.

[0070] Based on the above technical problems, the present application provides a technical scheme, which integrally forms the bottom wall and the first side wall, so that the bottom wall and the first side wall can be prepared by a bending process, thereby reducing the manufacturing difficulty of the bottom wall, improving the manufacturing yield of the shell body, and reducing the manufacturing cost.

[0071] The technical solutions described in the embodiments of the present application are applicable to a battery and a power consumption device using the battery, and the power consumption device is, for example, a mobile phone, a portable device, a notebook computer, an electric vehicle, an electric automobile, a ship, a spacecraft, an electric toy and an electric tool, and the like, wherein the spacecraft is, for example, an airplane, a rocket, a space shuttle and a spacecraft, and the like, the electric toy includes, for example, a fixed or mobile electric toy, and specifically, for example, a game machine, an electric automobile toy, an electric ship toy and an electric airplane toy, and the like, and the electric tool includes, for example, a metal cutting electric tool, a grinding electric tool, an assembling electric tool and a railway electric tool, and specifically, for example, an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact electric drill, a concrete vibrator and an electric planer.

[0072] The battery cell described in the embodiments of the present application is not only limited to the power consumption device described above, but for the sake of brevity, the following embodiments are described by taking an electric automobile as an example.

[0073] Please refer to Figure 1 , Figure 1 is a structural schematic diagram of a vehicle provided by the embodiments of the present application. The vehicle 1000 can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range extended automobile, and the like. The vehicle 1000 can be provided with a battery 100, for example, the battery 100 can be arranged at the bottom, the front or the rear of the vehicle 1000. The battery 100 can be used for power supply of the vehicle 1000, for example, the battery 100 can be used as an operating power supply of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300, and the controller 200 is used to control the power supply of the battery to the motor 300. The battery can be used for starting, navigation and the like of the vehicle 1000, and of course, the battery 100 can also be used to drive the vehicle 1000 to run, and replace or partially replace fuel or natural gas to provide driving for the vehicle 1000.

[0074] Figure 2 is an explosion structural schematic diagram of a battery provided by the embodiments of the present application. As shown in Figure 2 , the battery 100 includes a box body 400 and a battery cell (not shown in the figure), and the battery cell is contained in the box body 400.

[0075] The housing 400 is used to house battery cells and can have various structures. In some embodiments, the housing 400 can include a first housing portion 410 and a second housing portion 420. The first housing portion 410 and the second housing portion 420 overlap each other and together define a receiving portion 430 for accommodating the battery cells. The second housing portion 420 can be a hollow structure with one end open. The first housing portion 410 is a plate-like structure, and the first housing portion 410 overlaps the open side of the second housing portion 420 to form the housing with the receiving portion 430. Alternatively, both the first housing portion 410 and the second housing portion 420 can be hollow structures with one end open. The open side of the first housing portion 410 overlaps the open side of the second housing portion 420 to form the housing 400 with the receiving portion 430. Of course, the first housing portion 410 and the second housing portion 420 can have various shapes, such as a cylinder, a rectangular parallelepiped, etc.

[0076] In the battery 100, there can be one or more battery cells. If there are multiple battery cells, they can be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to a combination of series and parallel connections. Multiple battery cells can be directly connected in series, in parallel, or in a hybrid configuration, and then the entire battery cell structure can be housed within the housing 400. Alternatively, multiple battery cells can be first connected in series, in parallel, or in a hybrid configuration to form a battery module 500, and then the multiple battery modules 500 can be connected in series, in parallel, or in a hybrid configuration to form a single unit and housed within the housing 400.

[0077] Figure 3 It is a structural schematic diagram of a battery module provided in an embodiment of the present application.

[0078] In some embodiments, as Figure 3 As shown, there are multiple battery cells 110, which are first connected in series, in parallel, or in series to form a battery module 500. The multiple battery modules 500 are then connected in series, in parallel, or in series to form a whole, which is then housed in a box.

[0079] Figure 4 This is a schematic diagram of the explosion structure of a battery cell provided in an embodiment of the present application. Figure 5 This is a structural schematic diagram of a shell provided in an embodiment of the present application. Figure 6 This is a schematic diagram of the explosion structure of a shell provided in an embodiment of the present application.

[0080] See also Figure 4 to Figure 6The battery cell 110 provided by the embodiments of the present application includes a shell 10, an electrode assembly 20, and an end cover 30. The shell 10 has an opening E. The electrode assembly 20 is accommodated in the shell 10. The end cover 30 covers the opening E. The shell 10 includes a first part 11 and a second part 12. The first part 11 is integrally formed and includes a bottom wall W1 and a first side wall W2. The bottom wall W1 is arranged opposite to the end cover 30. The first side wall W2 and the second part 12 are both connected to the bottom wall W1 and the end cover 30. The first side wall W2 and the second part 12 are connected and define the opening E.

[0081] In some embodiments, the shell 10 and the end cover 30 can form an outer shell for packaging the electrode assembly 20 and other components such as electrolyte. The outer shell can be a steel shell, an aluminum shell, a plastic shell (e.g., polypropylene), a composite metal shell (e.g., copper-aluminum composite shell), or an aluminum-plastic film, etc.

[0082] In some embodiments, the outer shell can be provided with functional components such as electrode terminals. The electrode terminals can be used to electrically connect with the electrode assembly 20 for outputting or inputting the electric energy of the battery cell 110.

[0083] In some embodiments, the outer shell can be provided with a current collecting member. The electrode assembly 20 can be electrically connected to the electrode terminals on the outer shell or on the end cover 30 through the current collecting member.

[0084] Optionally, the shape of the shell 10 can include a cuboid, a square, or other shapes. Optionally, the shape of the end cover 30 can be matched with the shell 10.

[0085] In some examples, the first part 11 and the second part 12 are fixedly connected by welding, riveting, or bonding. In other examples, the shell 10 further includes a third part. The first side wall W2, the second part 12, and the third part are all connected to the bottom wall W1 and the end cover 30. The first side wall W2, the second part 12, and the third part are connected and define the opening E.

[0086] In some examples, the thickness of the bottom wall W1 and the first side wall W2 can be the same, or different.

[0087] In some examples, the first part 11 can be integrally formed by a bending process.

[0088] In some examples, the second part 12 includes one or more side walls. For example, the shell 10 further includes a third part. One side wall, the third part, and the first side wall W2 are connected and define the opening E. Or, multiple side walls and the first side wall W2 are connected and define the opening E.

[0089] For example, when the second part 12 includes multiple side walls, the second part 12 can be integrally formed.

[0090] Optionally, the first side wall W2 and the second component 12 are fixedly connected with the end cover 30 by welding, riveting, bonding or the like.

[0091] The battery monomer 110 provided by the embodiment of the application is integrally formed by the bottom wall W1 and the first side wall W2, so that the bottom wall W1 and the first side wall W2 can be prepared by a bending process, thereby reducing the manufacturing difficulty of the bottom wall W1, improving the manufacturing yield of the shell 10, and reducing the manufacturing cost.

[0092] In some optional embodiments, referring to Figure 4 to Figure 6 The second component 12 includes a second side wall W3 and a third side wall W4, the first side wall W2 and the second side wall W3 are oppositely arranged, and the first side wall W2 and the second side wall W3 are connected by the third side wall W4.

[0093] Optionally, the second side wall W3 and the third side wall W4 can be integrally formed. For example, the second side wall W3 and the third side wall W4 are integrally formed by bending.

[0094] In some examples, the area of the first side wall W2 is less than or equal to the area of the third side wall W4.

[0095] In some examples, the second component 12 includes one third side wall W4. Exemplarily, the first component 11 can also include one third side wall W4. Or a third component is further included, and the third component includes one third side wall W4. Or the second component 12 includes two third side walls W4. Exemplarily, the second component 12 is in a C shape, and the first component 11 is in an L shape.

[0096] In some examples, the first side wall W2, the second side wall W3 and the third side wall W4 enclose a hollow structure of a cuboid.

[0097] In some examples, the first component 11 can be connected with the second component 12 after being bent to form the bottom wall W1 and the first side wall W2. In other examples, a part of the first component 11 can be connected with the second component 12 to form the bottom wall W1 or the first side wall W2, and then the first component 11 is bent to form the bottom wall W1 and the first side wall W2, and the other part is connected with the second component 12.

[0098] In these optional embodiments, by the above arrangement, the number of side walls integrally formed with the bottom wall W1 is reduced, thereby reducing the manufacturing difficulty of the first component 11, improving the manufacturing yield of the shell 10, thereby improving the manufacturing yield of the battery monomer 110 and reducing the manufacturing cost.

[0099] In some optional embodiments, referring to Figure 4 to Figure 6The area of the first side wall W2 is greater than the area of the third side wall W4, which is conducive to increasing the connecting size between the first side wall W2 and the bottom wall W1, improving the connecting strength of the bottom wall W1 and the first side wall W2, thereby reducing the possibility of breaking when the first side wall W2 and the bottom wall W1 are integrally formed, and improving the reliability of the first component 11.

[0100] Further, the area of the first side wall W2 is the same as the area of the second side wall W3, and the area of the second side wall W3 is greater than the area of the third side wall W4.

[0101] Figure 7 is Figure 6 An enlarged schematic view of the structure of P in FIG.

[0102] In some optional embodiments, referring to Figure 4 , Figure 5 and Figure 7 , the third side wall W4 and the first side wall W2 are welded to form the first welding mark H1, and in the direction of the second side wall W3 pointing to the first side wall W2, the first welding mark H1 does not exceed the surface of the first side wall W2 away from the second side wall W3.

[0103] Optionally, the third side wall W4 and the first side wall W2 can be fixedly connected by means of alignment welding to form the first welding mark H1.

[0104] In some examples, the number of third side walls W4 is two, and two first welding marks H1 are formed between the two third side walls W4 and the first side wall W2.

[0105] In some embodiments, the first welding mark H1 is formed on the outer surface of the third side wall W4 away from the opening E and the side surface of the first side wall W2 between the third side wall W4 and the first side wall W2. The side surface is the surface of the first side wall W2 on the same side as the outer surface of the third side wall W4 away from the opening E. After the first welding mark H1 is formed, the part of the first welding mark H1 on the outer surface and the side surface is arranged in the direction of the second side wall W3 pointing to the first side wall W2, and does not exceed the surface of the first side wall W2 away from the second side wall W3, so as to avoid the first welding mark H1 protruding from the surface of the first side wall W2 away from the second side wall W3, thereby reducing the risk of the first welding mark H1 loosening or even falling off due to interference with other components, and improving the reliability of the shell 10.

[0106] Figure 8 is Figure 6 Another enlarged schematic view of the structure of P in FIG.

[0107] In some optional embodiments, referring to Figure 4 , Figure 5 and Figure 8The electrode assembly 20 includes a flat portion 21 and a bent portion 22. The third side wall W4 and the first side wall W2 are welded and form a second welding mark H2 on a side of the first side wall W2 away from the second side wall W3. In a direction of the second side wall W3 pointing to the first side wall W2, the second welding mark H2 and the flat portion 21 are arranged without overlapping.

[0108] In an example, in the direction of the second side wall W3 pointing to the first side wall W2, the projection of the second welding mark H2 and the projection of the flat portion 21 are arranged without overlapping.

[0109] In an example, the electrode assembly 20 is wound. After the electrode assembly 20 is wound, the flat portion 21 and the bent portion 22 are formed. The area of the flat portion 21 is greater than the area of the bent portion 22. The second welding mark H2 can be formed by penetration welding to fix the third side wall W4 and the first side wall W2 together. When the electrode assembly 20 is in thermal runaway and expands, the flat portion 21 will press the first side wall W2 and the second side wall W3 due to the large area of the flat portion 21. In the direction of the second side wall W3 pointing to the first side wall W2, the second welding mark H2 and the flat portion 21 are arranged without overlapping, so that the flat portion 21 will not directly press the second welding mark H2, thereby reducing the possibility of the second welding mark H2 cracking when the flat portion 21 expands, and improving the reliability of the battery monomer 110.

[0110] Figure 9 is a top view structural schematic diagram of a shell provided by an embodiment of the present application.

[0111] In some optional embodiments, referring to Figure 9 The third side wall W4 abuts against the surface of the first side wall W2 facing the second side wall W3, so as to reduce the assembly difficulty of the third side wall W4 and the first side wall W2 and improve the production efficiency.

[0112] In an example, in the direction of the second side wall W3 pointing to the first side wall W2, the projection of the second side wall W3 and the projection of the third side wall W4 both fall within the projection of the first side wall W2.

[0113] In some examples, the outer surface of the third side wall W4 on the side away from the opening E is flush with the side surface of the first side wall W2.

[0114] Figure 10 is another top view structural schematic diagram of a shell provided by an embodiment of the present application.

[0115] In some optional embodiments, referring to Figure 10 The number of the third side wall W4 includes two. The two third side walls W4 are oppositely arranged. At least part of the first side wall W2 is located between the two third side walls W4.

[0116] In some examples, the first side wall W2 is located between two third side walls W4, and a side surface of the first side wall W2 is in abutment with an inner surface of the third side wall W4 on a side of the third side wall W4 facing the opening E. In other examples, a portion of the first side wall W2 is located between two third side walls W4, and another portion of the first side wall W2 is in abutment with the third side wall W4 on a side of the first side wall W2 facing the second side wall W3.

[0117] In these optional embodiments, by the above arrangement, the difficulty of aligning the third side wall W4 and the first side wall W2 is reduced, and the third side wall W4 can clamp the first side wall W2, so as to reduce the possibility of misalignment of the first side wall W2 and the third side wall W4 during fixing.

[0118] In some optional embodiments, referring to Figure 10 , the second side wall W3 and the third side wall W4 are connected through a circular corner, and when the second side wall W3 and the third side wall W4 are formed through a bending process, the circular corner can release stress, so as to reduce the possibility of breakage between the second side wall W3 and the third side wall W4.

[0119] In some examples, the second side wall W3 and the third side wall W4 in the second component 12 are connected through a circular corner, the first side wall W2 and the third side wall W4 in the first component 11 are in abutment, the shape of the end cover 30 is matched with the shape of the side wall, the edge corner of the end cover 30 can include a first edge corner and a second edge corner, the first edge corner is arranged corresponding to the circular corner, and the outer contour shape of the first edge corner can be in a circular arc shape, and the second edge corner is arranged corresponding to the abutment position of the first side wall W2 and the third side wall W4, and the outer contour shape of the second edge corner can be in a right angle.

[0120] Figure 11 is another schematic diagram of an explosion structure of a shell provided by an embodiment of the present application.

[0121] In some optional embodiments, referring to Figure 4 , Figure 5 and Figure 11 , the second component 12 includes a second side wall W3 and a first third side wall W41, the first component 11 further includes a second third side wall W42, the second side wall W3 is arranged opposite to the first side wall W2, the first third side wall W41 and the second third side wall W42 are arranged opposite to each other, and the first side wall W2 and the second side wall W3 are connected through the third side wall W4.

[0122] For example, the second component 12 includes a second side wall W3 and a first third side wall W41, the first component 11 includes a bottom wall W1, a first side wall W2 and a second third side wall W42, the first side wall W2, the second side wall W3, the first third side wall W41 and the second third side wall W42 are connected to each other to define the opening E.

[0123] In some examples, the first side wall W2 and the bottom wall W1 in the first component 11 are integrally formed, and the third side wall W4 and the first side wall W2 are integrally formed, in other words, after unfolding the first component 11, the corresponding area of the first side wall W2 and the corresponding area of the bottom wall W1 are connected, the corresponding area of the third side wall W4 and the corresponding area of the first side wall W2 are connected, and the third side wall W4 and the bottom wall W1 are arranged separately. In other examples, the first side wall W2 and the bottom wall W1 are integrally formed, the third side wall W4 and the bottom wall W1 are integrally formed, or the third side wall W4 and the bottom wall W1 are integrally formed, and the third side wall W4 and the first side wall W2 are integrally formed.

[0124] Exemplarily, the first side wall W2 in the first component 11 is fixedly connected with the first third side wall W41 in the second component 12, and the second third side wall W42 in the first component 11 is fixedly connected with the second side wall W3 in the second component 12.

[0125] In these optional embodiments, by the above arrangement, increasing the number of side walls integrally formed with the bottom wall W1 is conducive to reducing the possibility of separation of the bottom wall W1 from the side wall, thereby improving the reliability of the shell 10.

[0126] Figure 12 is a schematic view of a cross-sectional structure of a battery monomer provided by an embodiment of the present application. Figure 13 is Figure 12 is a schematic view of an amplification structure of Q in

[0127] In some optional embodiments, referring to Figure 6 , Figure 12 and Figure 13 , the bottom wall W1 is welded with the second component 12, and a third welding mark H3 is formed on the side of the bottom wall W1 away from the second component 12, and the thickness of at least part of the second component 12 is greater than the thickness of the bottom wall W1.

[0128] Exemplarily, the surface of the bottom wall W1 on the side facing the opening E is abutted with the second component 12, the welding of the bottom wall W1 with the second component 12 can be fixedly connected by penetrating welding from the side of the bottom wall W1 away from the second component 12 and forming a third welding mark H3, and the thickness of the second component 12 is greater than the thickness of the bottom wall W1, which is conducive to reducing the welding difficulty and improving the reliability after welding.

[0129] In some examples, the overall thickness of the second component 12 is greater than the thickness of the bottom wall W1. In some examples, part of the thickness of the second component 12 is greater than the thickness of the bottom wall W1, exemplarily, the second component 12 includes the second side wall W3 and the third side wall W4, the thickness of the second side wall W3 is greater than the thickness of the bottom wall W1, and / or the thickness of the third side wall W4 is greater than the thickness of the bottom wall W1.

[0130] In some alternative embodiments, the material of the shell 10 comprises steel material, which is advantageous for reducing manufacturing cost and improving the overall strength of the shell 10.

[0131] In some alternative embodiments, the thickness of the first component 11 and the thickness of the second component 12 are the same, which is advantageous for reducing the difference between the strength of the first component 11 and the strength of the second component 12, improving the versatility of the first component 11 and the second component 12, and reducing manufacturing cost.

[0132] For example, the thickness of the bottom wall W1 in the first component 11 and the thickness of the second side wall W3 in the second component 12 are the same, the thickness of the bottom wall W1 in the first component 11 and the thickness of the third side wall W4 in the second component 12 are the same, the thickness of the first side wall W2 in the first component 11 and the thickness of the second side wall W3 in the second component 12 are the same, and the thickness of the first side wall W2 in the first component 11 and the thickness of the third side wall W4 in the second component 12 are the same.

[0133] In a second aspect, the embodiments of the present application provide a battery 100, which comprises the battery cell 110 in any of the foregoing embodiments.

[0134] Since the battery 100 provided by the embodiments of the present application comprises the battery cell 110 in any of the foregoing embodiments, the battery 100 provided by the embodiments of the present application has the beneficial effects of the battery cell 110 in any of the foregoing embodiments, which will not be described here again.

[0135] In a third aspect, the embodiments of the present application provide a power consumption device, which comprises the battery in any of the foregoing embodiments, and the battery is used to provide electric energy.

[0136] According to some embodiments of the present application, referring to Figure 4 to Figure 6 , the battery cell 110 comprises a shell 10, an electrode assembly 20, and an end cover 30. The shell 10 has an opening E. The electrode assembly 20 is accommodated in the shell 10. The end cover 30 covers the opening E; wherein the shell 10 comprises a first component 11 and a second component 12, the first component 11 is integrally formed and comprises a bottom wall W1 and a first side wall W2, the bottom wall is arranged opposite to the end cover 30, the first side wall W2 and the second component 12 are both connected to the bottom wall W1 and the end cover 30, and the first side wall W2 and the second component 12 are connected and define the opening E.

[0137] The second component 12 comprises a second side wall W3 and a third side wall W4, the first side wall W2 and the second side wall W3 are arranged opposite to each other, and the first side wall W2 and the second side wall W3 are connected through the third side wall W4. The area of the first side wall W2 is greater than the area of the third side wall W4.

[0138] The third side wall and the first side wall W2 are welded and form a first weld H1, in a direction along the second side wall W3 pointing to the first side wall W2, the first weld H1 does not exceed the surface of the first side wall W2 facing away from the second side wall W3. The second side wall and the third side wall W4 are connected by a circular arc corner transition. The material of the housing comprises steel.

[0139] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: a housing having an opening; an electrode assembly, housed in the housing; an end cover, covering the opening; The shell includes a first component and a second component, the first component is integrally formed and includes a bottom wall and a first side wall, the bottom wall is arranged opposite to the end cover, the first side wall and the second component are both connected to the bottom wall and the end cover, and the first side wall and the second component are connected and define the opening.

2. The battery cell according to claim 1, wherein: The second component includes a second side wall and a third side wall. The first side wall and the second side wall are arranged opposite to each other, and the first side wall and the second side wall are connected through the third side wall.

3. The battery cell according to claim 2, characterized in that: An area of ​​the first side wall is greater than an area of ​​the third side wall.

4. The battery cell according to claim 3, characterized in that The third side wall and the first side wall are welded to form a first weld mark, which is directed along the second side wall toward the first side wall. The first weld mark does not exceed the surface of the first side wall facing away from the second side wall.

5. The battery cell according to claim 3, characterized in that: The electrode assembly includes a straight portion and a bent portion. The third side wall and the first side wall are welded to form a second weld mark on the side of the first side wall facing away from the second side wall, and the second weld mark and the straight portion are arranged without overlapping.

6. The battery cell according to claim 2, characterized in that The third side wall abuts against a surface of the first side wall facing the second side wall.

7. The battery cell according to claim 2, characterized in that: The number of the third side walls includes two, the two third side walls are arranged opposite to each other, and at least a portion of the first side wall is located between the two third side walls.

8. The battery cell according to claim 2, characterized in that The second side wall and the third side wall are connected by an arc angle transition.

9. The battery cell according to claim 1, characterized in that The second component includes a second side wall and a first third side wall, the first component also includes a second third side wall, the second side wall is arranged opposite to the first side wall, the first third side wall and the second third side wall are arranged opposite to each other, and the first side wall and the second side wall are connected through the third side wall.

10. The battery cell according to claim 1, characterized in that The bottom wall is welded to the second component and a third weld mark is formed on a side of the bottom wall facing away from the second component. The thickness of at least a portion of the second component is greater than that of the bottom wall.

11. The battery cell according to claim 1, characterized in that The material of the housing includes steel.

12. The battery cell according to claim 1, wherein The thickness of the first component and the thickness of the second component are the same.

13. A battery, characterized in that: The battery cell comprises the battery cell according to any one of claims 1 to 12.

14. An electrical device, characterized in that: The battery of claim 13 is provided for providing electrical energy.

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